Lighting fixture



FIG. 1 is a side perspective view of a lighting fixture showing my new design;

FIG. 2 is a side view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The adapter is shown in broken lines in FIG. 1 for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a lighting fixture, as shown and described. 